I'm sorry that this has happened to you, but believe me when I say that things WILL get easier.
I was in a relationship with someone for 9 years from the age of 14. At the beginning of this year, he suddenly upped and left, told me he didn't love me anymore and broke my heart. I thought I would never get over it, but now I am in a happy relationship with somebody who I love with all of my heart and who loves me. It made me realise that my previous long term relationship was actually very toxic and not good for me at all. So basically, I got over it! And I got over it quicker than I thought, and you will to. I promise.